Volume 5 has turned up. Thought you might be interested if
you hadn't found it yet...

http://archive.org/details/HoltzapffelVol5_1884

Turning and Mechanical Manipulation - John Jacob Holtzapffel
This is Volume 5 of the work "Turning and Mechanical Manipulation" by
Charles Holtzapffel and John Jacob Holtzapffel. The volume title for
this volume is "The Principles and Practice of Ornamental or Complex
Turning." (London: Published for the Author by Holtzapffel and Co.,
1884.) This is the central work of the field of Ornamental Turning.

--
Leon Fisk
Grand Rapids MI/Zone 5b
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